Peru, a country on the Pacific coast of South America, 1 (make) up of three main areas. They are narrow, dry, flat land 2 (run) along the coast, the Andes Mountains, 3 the Amazon rainforest. Peru used to be 4 center of the powerful ancient Inca Empire, whose emperor 5 (live) ...
Scientists with the University of Chicago have laid out a comprehensive theory for how our solar system could have formed in the wind-blown bubbles around a giant, long-dead star. Published Dec. 22 in theAstrophysical Journal, the study addresses a nagging cosmic mystery about the abundance of ...